Words in english starting with O

• Orange Free State — Noun – English ～ a province in central South Africa that was colonized by the Boers; named Free State in 1997
• Old Line State — Noun – English ～ a Mid-Atlantic state; one of the original 13 colonies
• Old North State — Noun – English ～ a state in southeastern United States; one of the original 13 colonies
• Old Dominion State — Noun – English ～ a state in the eastern United States; one of the original 13 colonies; one of the Confederate States in the American Civil War
• Ocean State — Noun – English ～ a state in New England; one of the original 13 colonies; the smallest state
• oxidation state — Noun – English ～ the degree of oxidation of an atom or ion or molecule; for simple atoms or ions the oxidation number is equal to the ionic charge; "the oxidation number of hydrogen is +1 and of oxygen is -2"
• operating statement — Noun – English ～ a financial statement that gives operating results for a specific period
• Organization of American States — Noun – English ～ an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation
• observation station — Noun – English ～ a station set up for making observations of something
• oil-hardened steel — Noun – English ～ steel that is quenched in oil
• order Stegocephalia — Noun – English ～ in former classifications a division of class Amphibia comprising all pre-Jurassic and some later extinct large salamandriform amphibia
• onion stem — Noun – English ～ a white agaric that tends to cluster and has a club-shaped base
• one-step — Noun – English ～ an early ballroom dance; precursor to the fox-trot
• one-step — Verb – English ～ dance the one-step
• order Stereospondyli — Noun – English ～ formerly a suborder of Stegocephalia; amphibia having vertebrae whose component elements are fused into a single piece; "most vertebrates are stereospondylous"
• order Mycelia Sterilia — Noun – English ～ order of imperfect fungi having no known spore stage
• oyster stew — Noun – English ～ oysters in cream
• overhand stitch — Noun – English ～ a stitch passing over an edge vertically
• OTC stock — Noun – English ～ stock that is not listed and traded on an organized exchange
• out of stock — Adjective – English ～ not available for sale or use; "too many items are out of stock"

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